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Rules for Naming Binary Ionic Compounds Containing a Metal Ion With a Variable Charge. A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal. For example, iron(III) iodide, FeI3, is composed of iron ions, Fe3+ (elemental iron is a metal), and iodide ions, I- (elemental iodine is a nonmetal). Rule 1.
First of all, there is no compound absolutely defined as ionic. All ionic compounds have, to some even small extent, a covalent character, i.e., a supperposition of atomic orbitals aside the electrostatic interaction (if you are considering LCAO - linear combination of atomic orbitals for sake of simplicity).